Compilare: user.cpp: In function ‘int main()’: user.cpp:29:27: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘char (*)[2000001]’ [-Wformat=] scanf("%s\n%s", &A, &B); ^ user.cpp:29:27: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[2000001]’ [-Wformat=] user.cpp: In function ‘int conv(char)’: user.cpp:23:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.cpp: In function ‘int main()’: user.cpp:26:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.in", "r", stdin); ^ user.cpp:27:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("strmatch.out", "w", stdout); ^ user.cpp:29:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s\n%s", &A, &B); ^